Store all three normal values in shaded rendering
Render shaded image in RenderImage
Shaded rendering now works
(with shader stolen from fstl)
Properly set normals
Increase max render resolution
Abort in-progress renders when updating
Switch RenderTask and RenderWorker

RenderTasks are transient, RenderWorkers last.
Remove debug message
Build bug-fixes for non-unity Ubuntu desktop environment
Merge branch 'shaded-render'